CN107480744B - Anti-counterfeit label generation method containing watermark information and anti-counterfeit label - Google Patents
Anti-counterfeit label generation method containing watermark information and anti-counterfeit label Download PDFInfo
- Publication number
- CN107480744B CN107480744B CN201710346186.XA CN201710346186A CN107480744B CN 107480744 B CN107480744 B CN 107480744B CN 201710346186 A CN201710346186 A CN 201710346186A CN 107480744 B CN107480744 B CN 107480744B
- Authority
- CN
- China
- Prior art keywords
- watermark
- image
- watermark information
- channel
- holographic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000001259 photo etching Methods 0.000 claims abstract description 22
- 239000002184 metal Substances 0.000 claims abstract description 13
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000007723 die pressing method Methods 0.000 claims abstract description 7
- 238000005323 electroforming Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 6
- 238000012545 processing Methods 0.000 claims abstract description 5
- 230000000694 effects Effects 0.000 claims description 8
- 238000007781 pre-processing Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 31
- 230000008569 process Effects 0.000 abstract description 6
- 230000004044 response Effects 0.000 abstract description 4
- 230000010354 integration Effects 0.000 abstract description 3
- 238000000206 photolithography Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 9
- 238000001459 lithography Methods 0.000 description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 230000003796 beauty Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 230000001131 transforming effect Effects 0.000 description 2
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003486 chemical etching Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000000609 electron-beam lithography Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001093 holography Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910001453 nickel ion Inorganic materials 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/02—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the selection of materials, e.g. to avoid wear during transport through the machine
- G06K19/022—Processes or apparatus therefor
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
- G06K19/06046—Constructional details
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06009—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with optically detectable marking
- G06K19/06046—Constructional details
- G06K19/06065—Constructional details the marking being at least partially represented by holographic means
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Holo Graphy (AREA)
Abstract
The invention discloses a method for generating an anti-counterfeit label containing watermark information, which comprises the following steps: s100, embedding watermark information in a watermark area of an original image to generate a watermark image containing the watermark information; s200, processing the watermark image and converting the watermark image into holographic plate making data; s300, forming a hologram on the photoetching offset plate according to the holographic plate making data; s400, forming a holographic die pressing plate containing the hologram on the metal nickel plate in an electroforming mode; s500, transferring the hologram on a plastic material through the holographic die pressing plate to generate the anti-counterfeiting label. According to the invention, the watermark information is embedded in the original image, and the watermark information is shown by diffraction of the holographic microstructure to be manufactured into the anti-counterfeiting label, so that perfect integration of the digital watermark technology and the holographic technology is realized, the brightness and the aesthetic degree of the hologram can be kept, meanwhile, the interference and the misjudgment rate of the hologram in the process of identifying and extracting the watermark information are reduced, and the response time is greatly shortened.
Description
Technical Field
The invention relates to the technical field of laser holographic anti-counterfeiting, in particular to an anti-counterfeiting label generating method containing watermark information and an anti-counterfeiting label.
Background
The laser holographic anti-fake technology is one kind of visible graph and text information produced on product by means of laser rainbow hologram plate making technology and mold pressing duplication technology. With the comprehensive utilization of computer dot matrix photoetching technology, 3D true color holographic technology, multiple and dynamic imaging technology and other technologies, the development of laser holographic anti-counterfeiting technology at higher level is promoted. The encryption technologies such as optical random interference fringes, optical micro, dynamic holography, space stereo, digital dot matrix images and the like developed by the technology are continuously emerging and become the mainstream direction of laser holographic anti-counterfeiting at present. These encryption schemes are all implemented at the laser platemaking stage using various special techniques that combine optical and computer information processing.
The digital watermarking technology is increasingly applied to modern printing anti-counterfeiting as a new anti-counterfeiting technology with high technical content, low cost and convenient application, and achieves good effect. The digital watermark can not only realize the addition of the digital watermark information into the digital information, but also realize the accurate extraction of the digital information through a scanner, a digital camera or special equipment after the digital information is printed or printed and output to a paper medium. The method is widely applied to the fields of digital information copyright protection, presswork anti-counterfeiting, information source tracing and the like.
With the continuous innovation of various novel anti-counterfeiting technologies, high-end products increasingly need solutions combining multiple anti-counterfeiting technologies. The holographic anti-counterfeiting technology and the digital watermark have the technical characteristics respectively, and the combination of the digital watermark technology and the holographic anti-counterfeiting technology also remains simple combination, such as printing digital watermark information on the surface of an existing hologram or combining a transparent material printed with the digital watermark information and an existing holographic anti-counterfeiting image to form the combination of the two technologies. However, this simple combination is detrimental to the brightness and aesthetics of the hologram, and also increases the false positive and response time due to interference from holographic diffracted light when extracting the watermark information.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method and a device for generating an anti-counterfeiting label containing watermark information, wherein the watermark information and a hologram are organically fused together to generate the anti-counterfeiting label, so that the anti-counterfeiting label not only has the light variation characteristics of the hologram, but also can be embedded with the watermark information in the hologram to realize stronger anti-counterfeiting.
The technical scheme provided by the invention is as follows:
the invention discloses a method for generating an anti-counterfeit label containing watermark information, which comprises the following steps: s100, embedding watermark information in a watermark area of an original image to generate a watermark image containing the watermark information; s200, processing the watermark image and converting the watermark image into holographic plate making data; s300, forming a hologram on the photoetching offset plate according to the holographic plate making data; s400, forming a holographic die pressing plate containing the hologram on the metal nickel plate in an electroforming mode; s500, transferring the hologram on a plastic material through the holographic die pressing plate to generate the anti-counterfeiting label.
According to the invention, the watermark information is embedded in the original image, and the watermark information is shown by diffraction of the holographic microstructure to be manufactured into the anti-counterfeiting label, so that perfect integration of the digital watermark technology and the holographic technology is realized, the brightness and the aesthetic degree of the hologram can be kept, meanwhile, the interference and the misjudgment rate of the hologram in the process of identifying and extracting the watermark information are reduced, and the response time is greatly shortened.
Further, the step S200 further includes the steps of: s210, dividing the watermark image into a plurality of different regional graphs according to a preset expression effect, and setting a corresponding spatial frequency parameter for each regional graph; s220, preprocessing the watermark image to obtain at least one channel gray image; s230, acquiring the gray value of each pixel point of the channel gray image; s240, acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list, and acquiring a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional graph to which each pixel point of the channel gray image belongs; and S250, generating a data packet by the grating angle value of each pixel point of the acquired channel gray image and the corresponding grating stripe frequency according to a preset rule.
Further, before the step S100, the method further includes the steps of: and S000, pre-configuring the preset corresponding relation list.
Further, the step S100 "embed watermark information in the watermark region" further includes the steps of: and S110, embedding watermark information in at least one channel of the watermark image by adopting a preset watermark algorithm.
Further, the step S220 of preprocessing the watermark image to obtain at least one channel grayscale image further includes the steps of: s221, acquiring a noise point information graph of the watermark image; s222, carrying out channel separation on the noise information graph to obtain the channel gray level image of at least one channel.
Further, the method further includes, between step S220 and step S230, the steps of: and S225, adjusting the gray scale threshold value of the channel gray scale image within a preset gray scale range.
Further, the predetermined gray scale range is 30 to 220.
Further, the spatial frequency values range from 200LP/mm to 1000 LP/mm.
Further, the grating angle ranges from 0 degrees to 180 degrees.
The invention also discloses an anti-counterfeiting label which is generated by adopting the anti-counterfeiting label generating method containing the watermark information.
Compared with the prior art, the invention combines the watermark information with the hologram, and realizes the expression of hidden information on the holographic microstructure by corresponding the gray value of the watermark image with the grating angle value for photoetching, thereby not only protecting the beauty and brightness of the hologram, but also avoiding the interference of the reading of the watermark information in the hologram, solving the limitation of the combined application of the two in the prior art, expanding the application range of the digital watermark, and simultaneously increasing a composite holographic anti-counterfeiting technology.
Drawings
The present invention will be further described in the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic diagram of the main steps of a method for producing an anti-counterfeit label containing watermark information according to the present invention;
FIG. 2 is a schematic diagram of one embodiment of the present invention;
FIG. 3 is a schematic view of another embodiment of the present invention;
FIG. 4 is a schematic diagram of yet another embodiment of the present invention;
FIG. 5 is a schematic diagram of another embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
Fig. 1 is a schematic diagram of main steps of a method for generating an anti-counterfeit label containing watermark information, and as shown in fig. 1, the method for generating an anti-counterfeit label containing watermark information includes the steps of: s100, embedding watermark information in a watermark area of an original image to generate a watermark image containing the watermark information; s200, processing the watermark image and converting the watermark image into holographic plate making data; s300, forming a hologram on the photoetching offset plate according to the holographic plate making data; s400, forming a holographic die pressing plate containing the hologram on the metal nickel plate in an electroforming mode; s500, transferring the hologram on a plastic material through the holographic die pressing plate to generate the anti-counterfeiting label.
Specifically, the original image can be an anti-counterfeiting mark or an anti-counterfeiting texture, and a brand-new anti-counterfeiting graphic image with attractive composition is generally designed by taking a LOGO, a pattern, character information and the like of a customer as design elements or materials and integrating factors such as anti-counterfeiting technical expression effect, mark manufacturing process requirements, dimension specifications and the like. The selection of the watermark region in the invention is selected by a client or a designer, and in the design process, the watermark information is embedded in which region or graph and whether the final effect of the region is compatible with the effect of other graphs or not are considered. However, the actual operation process may decide to add the embedded watermark information after the design pattern is determined. This requires selecting a relatively large area of the image as the watermark region for embedding the watermark.
The invention embeds watermark information into the original image, expresses the watermark information through diffraction of the holographic microstructure, forms the holographic mould pressing plate after electroforming, and transfers the holographic mould pressing plate to the plastic material to generate the anti-counterfeiting label, thereby realizing perfect integration of the digital watermark technology and the holographic technology, not only keeping the brightness and the aesthetic degree of the hologram, but also reducing the interference and the misjudgment rate of the hologram when identifying and extracting the watermark information, and greatly shortening the response time.
Preferably, the step S200 further includes the steps of: s210, dividing the watermark image into a plurality of different regional graphs according to a preset expression effect, and setting a corresponding spatial frequency parameter for each regional graph; s220, preprocessing the watermark image to obtain at least one channel gray image; s230, acquiring the gray value of each pixel point of the channel gray image; s240, acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list, and acquiring a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional graph to which each pixel point of the channel gray image belongs; and S250, generating a data packet by the grating angle value of each pixel point of the acquired channel gray image and the corresponding grating stripe frequency according to a preset rule.
Preferably, before S100, the method further includes: and S000, pre-configuring the preset corresponding relation list.
Preferably, the step S100 "embedding watermark information in the watermark region" further includes the steps of: and S110, embedding watermark information in at least one channel of the watermark image by adopting a preset watermark algorithm.
Specifically, the watermark information may be substantially a digital secret information expression form such as numbers, letters, even graphic patterns, and the like, and embedding the watermark information in the watermark region of the original image means transforming the image in the selected watermark region by a specific watermark embedding algorithm, embedding the watermark information in the image in the watermark region by an encoding method (encoding into 01 bits), and specifically transforming a parameter value of a certain channel of the image.
Preferably, the step S220 of preprocessing the watermark image to obtain at least one channel grayscale image further includes the steps of: s221, acquiring a noise point information graph of the watermark image; s222, carrying out channel separation on the noise information graph to obtain the channel gray level image of at least one channel.
Specifically, the watermark information can be respectively embedded into 3 channels, the channel gray level image of each single channel is obtained in a channel separation mode, and the watermark information is embedded into the multiple channels, so that the anti-counterfeiting strength is increased.
The watermark embedding algorithm adopted by the invention is to embed watermark information into a certain channel of the image and then output the watermark image in an RGB mode, so that the channel gray level image containing the encrypted watermark information can be obtained only after the channel is separated. This step can also be omitted if the "watermark embedding software" existing in the prior art is a module with its own output mode conversion.
Preferably, the method further includes, between step S220 and step S230, the steps of: and S225, adjusting the gray scale threshold value of the channel gray scale image within a preset gray scale range. Preferably, the preset gray scale range is 30 to 220.
The invention adjusts the gray scale threshold of the channel gray scale image by establishing the gradual change mapping model, and can also achieve the same effect by changing the color level. And is not particularly limited herein. The invention designs the gray value and the grating angle to be in one-to-one correspondence, so the gray value is the grating angle value, and further the direction of the diffraction light of the grating is controlled, and the diffraction light is adjusted to the preset gray scale range because the diffraction light of the grating in the range can be collected by the camera lens and then converted into an electric signal for operation. And diffraction light at grating angles outside this range cannot be collected by the camera, which becomes invalid information. Therefore, in order to record and restore the encrypted signal carried by the watermark image to the maximum extent, the gray scale threshold is preferably in the preset gray scale range. Specifically, the gray level threshold is adjusted to the preset gray level range in the invention to adapt to the operation standard, and meanwhile, the preset gray level range 30 to 220 is also the optimal range value obtained by a designer through multiple experiments.
Preferably, the spatial frequency values range from 200LP/mm to 1000 LP/mm.
The invention carries out region segmentation on a watermark image embedded with watermark information, and aims to set different spatial frequency parameters for different region graphs so as to realize different microstructure stripes and show rich colors.
Preferably, the grating angle ranges from 0 degrees to 180 degrees.
Specifically, step S250 of generating a data packet by using the obtained grating angle value of each pixel point of the channel gray image and the corresponding grating fringe frequency according to a preset rule specifically includes:
1. when watermark information is only embedded in a single channel of the watermark image, a dot matrix is generated on the photoetching offset plate according to the number of pixel points of the channel gray level image and is used for point-by-point exposure. The channel gray level image of the channel in which the watermark information is embedded is obtained, specifically, a noise information map of the watermark image is obtained, channel separation is performed on the noise information map, and the channel gray level image of the channel in which the watermark information is embedded is obtained.
Acquiring a gray value of each pixel point of the channel gray image, acquiring a grating angle value corresponding to the gray value of each pixel point according to a preset corresponding relation list, and acquiring a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional graph to which each pixel point of the channel gray image belongs.
And photoetching the corresponding pixel points on the photoetching offset plate according to the grating angle value and the grating fringe frequency of each pixel point.
FIG. 2 is a schematic diagram of an embodiment of the present invention. As shown in fig. 2, a represents a pixel point of the channel gray image, a represents a pixel point of the lithography offset, and when watermark information is embedded in a single channel, the pixel point a is subjected to lithography according to the grating angle value and the grating fringe frequency of the pixel point a of the channel gray image.
2. When watermark information is embedded into a plurality of channels of the watermark image, the number of pixel points on the photoetching plate is increased and is larger than the sum of the number of the pixel points of the plurality of channels. Taking two channels as an example, the following are specific:
and acquiring channel gray level images of two channels embedded with watermark information, specifically acquiring noise information maps of the watermark images, performing channel separation on the noise information maps, and respectively acquiring the channel gray level images of each channel.
Respectively obtaining the gray value of each pixel point in each channel gray image, obtaining the grating angle value corresponding to the gray value of each pixel point according to a preset corresponding relation list, and obtaining the grating stripe frequency corresponding to each pixel point according to the spatial frequency parameter corresponding to the regional graph to which each pixel point of the channel gray image belongs.
And increasing the number of pixel points on the photoetching offset plate to be the sum of the number of pixel points of the two-channel gray level image. FIG. 3 is a schematic diagram of another embodiment of the present invention. As shown in fig. 3, a represents a pixel point of a first channel gray image, B represents a pixel point of another channel gray image, a, B, c, d represent a pixel point of a photolithography offset plate respectively, when watermark information is embedded in two channels, photolithography is performed on the pixel point a of the photolithography offset plate according to the grating angle value and the grating fringe frequency of the pixel point a of the first channel gray image, photolithography is performed on the pixel point B of the photolithography offset plate according to the grating angle value and the grating fringe frequency of the pixel point B of the another channel gray image, and the remaining pixel points c and d on the photolithography offset plate are vacant and are not subjected to photolithography. As can be seen from fig. 3, the resolution of the offset lithography plate is 4 times the resolution of the channel gray scale image.
The above embodiments are merely two examples, including but not limited to the above two cases. If watermark information is embedded in the three channels, correspondingly, the resolution of the photoetching offset plate is only required to be improved, and the number of pixel points on the photoetching offset plate is larger than the sum of the pixel points of the gray level images of the three channels. FIG. 4 is a schematic diagram of another embodiment of the present invention. As shown in fig. 4, a represents a pixel point of a first channel gray image, B represents a pixel point of a second channel gray image, C represents a pixel point of a third channel gray image, a, B, C, d represent a pixel point of a photolithography offset plate respectively, when watermark information is embedded in three channels, photolithography is performed on the pixel point a of the photolithography offset plate according to the grating angle value and the grating stripe frequency of the pixel point a of the first channel gray image, photolithography is performed on the pixel point B of the photolithography offset plate according to the grating angle value and the grating stripe frequency of the pixel point B of the second channel gray image, photolithography is performed on the pixel point C of the photolithography offset plate according to the grating angle value and the grating stripe frequency of the pixel point C of the third channel gray image, and the remaining pixel point d of the photolithography offset plate is vacant and is not subjected to photolithography.
FIG. 5 is a schematic diagram of another embodiment of the present invention. As shown in fig. 5, a represents a pixel point of the first channel gray image, B represents a pixel point of the second channel gray image, C represents a pixel point of the third channel gray image, a1, a2, a3, B1, B2, B3, C1, C2, C3 are pixel points on the lithographic offset plate respectively, photoetching is carried out on three pixel points a1, a2 and a3 according to the grating angle value and the grating stripe frequency of the pixel point A of the first channel gray level image, that is, the pixel point a of the first channel gray image is represented by three pixel points on the photolithography offset plate, and similarly, photoetching is carried out on three pixel points B1, B2 and B3 according to the grating angle value and the grating stripe frequency of the pixel point B of the second channel gray level image, and photoetching on three pixel points of C1, C2 and C3 according to the grating angle value and the grating stripe frequency of the C pixel point of the third channel gray level image.
It can be known from the above embodiments that the present invention does not specifically limit a pixel point for representing a channel gray image by using several pixel points on a lithography offset plate, and the pixel point is defined by itself according to actual needs.
Specifically, the structure of the diffraction grating in the hologram according to the present invention is not limited to the hologram technology, but may be formed by a method including various mechanical processing structures, chemical etching, a photomask technology, a semiconductor lithography technology, an ion lithography technology, an electron beam lithography technology, etc. which can generate or form grating structures of different angles and frequencies.
Meanwhile, in order to improve the aesthetic degree of the hologram, other anti-counterfeiting technical characteristics or grating microstructure information can be nested in the digital watermark hologram, and the application method is not limited to the method of separating graphic blocks, separating pixel filter points with various distribution proportions or superposing a multi-grating structure.
Specifically, the hologram is microscopically composed of concave-convex relief type grating stripes with different frequencies and different angles, after the hologram containing watermark information is generated by adopting the method, the microstructure stripes represented by the hologram are recorded on the photoetching plate, and the microstructure stripes on the photoetching plate are solidified on the wear-resistant reusable hard metal material because the photoetching plate is very fragile, easy to damage and incapable of being copied in batches.
The metal template containing the microstructure stripes, or the laser template, is usually obtained by silver spraying and electroforming. Specifically, the method comprises the following technical processes:
1. a silver conductive layer is formed on the surface of the photoetching offset plate hologram by a chemical silvering method so as to make the silver conductive layer conductive.
2. The photoetching offset plate with the silver conducting layer is used as a cathode, the cathode is placed in electrolyte containing nickel ions, and metal nickel is plated on a silver layer of the cathode by utilizing the principle of electrolytic plating and is deposited to a certain thickness.
3. And taking out the plate deposited with the nickel metal with a certain thickness, removing the glass plate, and washing away the photoresist on the surface layer of the metal plate to obtain the hologram metal template with the mirror image pattern.
4. Similarly, the hologram metal template is put into the electroforming equipment as the cathode again, and a mirror image second generation metal template can be obtained, and the descendant metal template can be copied by the same method.
The holographic pattern can be transferred and copied on various plastic materials by using the metal template, and then the holographic product, namely an anti-counterfeiting product or an anti-counterfeiting label, can be obtained.
The anti-counterfeit label generated by the method is generally a laser packaging material, and piracy can be prevented by identifying the anti-counterfeit label. The specific identification process is as follows:
and acquiring optical information diffracted by the hologram on the anti-counterfeiting label, and acquiring corresponding holographic data according to the optical information. The holographic data refers to the grating fringe frequency and the grating angle value of each pixel point. And acquiring image data corresponding to the holographic data according to the preset corresponding relation list, wherein the image data refers to the gray value of the pixel point. And (4) corresponding the grating angle value and the gray value by self-defining a preset corresponding relation list to obtain the gray value of each pixel point. And calculating the gray value by adopting a preset algorithm, acquiring a watermark characteristic value, comparing whether the watermark characteristic value is matched with preset watermark information or not, and feeding back correct watermark information when the watermark characteristic value is matched with the preset watermark information.
The invention also discloses an anti-counterfeit label which is generated by adopting the method.
The invention combines the watermark information with the hologram, and realizes the expression of hidden information on the holographic microstructure by corresponding the gray value of the watermark image with the grating angle value for photoetching, thereby not only protecting the beauty and brightness of the hologram, but also avoiding interfering the reading of the watermark information in the hologram, solving the limitation of the combination application of the two in the prior art, expanding the application range of the digital watermark, and simultaneously increasing a composite holographic anti-counterfeiting technology.
It should be noted that the information interaction, execution process, and other contents between the modules in the apparatus are based on the same concept as the method embodiment, and specific contents may refer to the description in the method embodiment of the present invention, and are not described herein again.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A method for generating an anti-counterfeit label containing watermark information is characterized by comprising the following steps:
s100, embedding watermark information in a watermark area of an original image to generate a watermark image containing the watermark information;
s200, processing the watermark image and converting the watermark image into holographic plate making data; the step S200 further includes the steps of:
s210, dividing the watermark image into a plurality of different regional graphs according to a preset expression effect, and setting a corresponding spatial frequency parameter for each regional graph;
s220, preprocessing the watermark image to obtain at least one channel gray image;
s230, acquiring the gray value of each pixel point of the channel gray image;
s240, acquiring a grating angle value corresponding to the gray value of each pixel point of the channel gray image according to a preset corresponding relation list, and acquiring a grating stripe frequency corresponding to each pixel point according to a spatial frequency parameter corresponding to a regional graph to which each pixel point of the channel gray image belongs;
s250, generating a data packet by the grating angle value of each pixel point of the acquired channel gray image and the corresponding grating stripe frequency according to a preset rule;
s300, forming a hologram on the photoetching offset plate according to the holographic plate making data;
s400, forming a holographic die pressing plate containing the hologram on the metal nickel plate in an electroforming mode;
s500, transferring the hologram on a plastic material through the holographic mould pressing plate to generate the anti-counterfeiting label.
2. The method for generating a security label containing imprinted information according to claim 1, wherein the step S100 is preceded by the step of:
and S000, pre-configuring the preset corresponding relation list.
3. The method for generating a security label with watermark information according to claim 1, wherein the step S100 "embed watermark information in the watermark region" further comprises the steps of:
and S110, embedding watermark information in at least one channel of the watermark image by adopting a preset watermark algorithm.
4. The method for generating an anti-counterfeit label containing watermark information according to claim 1, wherein the step S220 "preprocessing the watermark image to obtain at least one channel gray image" further comprises the steps of:
s221, acquiring a noise point information graph of the watermark image;
s222, carrying out channel separation on the noise information graph to obtain the channel gray level image of at least one channel.
5. The method for generating a security label containing imprinted information as claimed in claim 1, further comprising between step S220 and step S230 the steps of:
s225, setting parameters of the gradient mapping model, and adjusting the gray scale threshold value of the channel gray scale image within a preset gray scale range.
6. The method of claim 5, wherein the predetermined gray scale range is 30 to 220.
7. The method of claim 1, wherein the spatial frequency parameter ranges from 200LP/mm to 1000 LP/mm.
8. The method of claim 1, wherein the grating angle value ranges from 0 degrees to 180 degrees.
9. A security label produced by the method for producing a security label containing watermark information according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710346186.XA CN107480744B (en) | 2017-05-17 | 2017-05-17 | Anti-counterfeit label generation method containing watermark information and anti-counterfeit label |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710346186.XA CN107480744B (en) | 2017-05-17 | 2017-05-17 | Anti-counterfeit label generation method containing watermark information and anti-counterfeit label |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107480744A CN107480744A (en) | 2017-12-15 |
| CN107480744B true CN107480744B (en) | 2020-09-15 |
Family
ID=60594350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710346186.XA Active CN107480744B (en) | 2017-05-17 | 2017-05-17 | Anti-counterfeit label generation method containing watermark information and anti-counterfeit label |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107480744B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445728B (en) * | 2018-01-25 | 2021-03-02 | 武汉华工图像技术开发有限公司 | Holographic anti-counterfeiting pattern processing method for pre-storing coded information |
| CN108537945B (en) * | 2018-03-09 | 2020-09-15 | 深圳怡化电脑股份有限公司 | Bill watermark detection method and system and self-service equipment |
| CN112150337B (en) * | 2019-06-28 | 2024-02-23 | 北京地平线机器人技术研发有限公司 | Image processing method and device and electronic equipment |
| CN111179147B (en) * | 2019-12-27 | 2023-04-18 | 武汉大学 | Super-surface-based design method for realizing double-color double-channel anti-counterfeiting with watermark |
| CN114295202A (en) * | 2021-12-29 | 2022-04-08 | 湖南汉状元教育科技有限公司 | Infrared information processing method and device, electronic equipment and readable storage medium |
| CN114332092B (en) * | 2022-03-16 | 2022-07-26 | 北京中科慧眼科技有限公司 | Defect image detection method, system, intelligent terminal and medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6252685B1 (en) * | 1998-11-06 | 2001-06-26 | Victor Company Of Japan, Ltd. | Optical recording medium and apparatus of judging fake thereof |
| CN1828666A (en) * | 2006-04-12 | 2006-09-06 | 上海理工大学 | Fake proof method for printing optical holographic watermark certificate |
| CN101122954A (en) * | 2007-09-13 | 2008-02-13 | 华中科技大学 | Method for diffuse reflection processing on metal cladding high polymer film |
| US7551750B2 (en) * | 2002-01-09 | 2009-06-23 | Jds Uniphase Corporation | Holographic digital watermark |
| CN103903039A (en) * | 2014-03-26 | 2014-07-02 | 深圳大学 | Hidden code holographic anti-counterfeiting film and manufacturing method and recognition system thereof |
-
2017
- 2017-05-17 CN CN201710346186.XA patent/CN107480744B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6252685B1 (en) * | 1998-11-06 | 2001-06-26 | Victor Company Of Japan, Ltd. | Optical recording medium and apparatus of judging fake thereof |
| US7551750B2 (en) * | 2002-01-09 | 2009-06-23 | Jds Uniphase Corporation | Holographic digital watermark |
| CN1828666A (en) * | 2006-04-12 | 2006-09-06 | 上海理工大学 | Fake proof method for printing optical holographic watermark certificate |
| CN101122954A (en) * | 2007-09-13 | 2008-02-13 | 华中科技大学 | Method for diffuse reflection processing on metal cladding high polymer film |
| CN103903039A (en) * | 2014-03-26 | 2014-07-02 | 深圳大学 | Hidden code holographic anti-counterfeiting film and manufacturing method and recognition system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107480744A (en) | 2017-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107480744B (en) | Anti-counterfeit label generation method containing watermark information and anti-counterfeit label | |
| CN107688843B (en) | Hologram generating method and device containing watermark information | |
| JP5520384B2 (en) | Method for generating a security binary image for a banknote | |
| US8985634B2 (en) | Anti-counterfeit printed matter, method of manufacturing the same, and recording medium storing halftone dot data creation software | |
| JP2009501348A (en) | Grating mage and manufacturing method | |
| JPS63503331A (en) | Diffraction device for security that is difficult to accurately reproduce and its manufacturing method | |
| CN107107646B (en) | Method for producing a security element and security element | |
| CN107480480B (en) | Copyright attribution tracking method and device | |
| US20030223102A1 (en) | Methods and apparatus for mass manufacturing two-dimensional binary information on transparent substrates using phase contrast modulated templates | |
| CN107481179A (en) | Antifalsification label recognition methods with watermarked information and device | |
| CN103722921B (en) | A kind of two screening anti-counterfeiting printing method | |
| US6844945B2 (en) | Hologram having authenticating information recorded therein | |
| US20120007946A1 (en) | Hologram reproduction image processing apparatus and processing method | |
| CN107688283B (en) | Method and device for manufacturing holographic molded plate containing watermark information and holographic molded plate | |
| JP2008225322A (en) | Optical diffraction structure having minute irregularities | |
| JP5332441B2 (en) | Diffraction grating recording medium | |
| CN101421667B (en) | Optically variable device mastering system, method of authenticating articles employing the same, and resultant article | |
| CN105894435A (en) | Novel anti-counterfeit label processing method | |
| US20070188836A1 (en) | Hologram having authentication information recorded therein | |
| JP3925035B2 (en) | Method for producing diffraction grating pattern | |
| JP2008242199A (en) | Color image using diffraction structure | |
| CN1580976A (en) | Method for manufacturing four-dimensional holographic light pillar anticounterfeit mark | |
| CN206598645U (en) | The holographic version of texture is stepped on by a kind of U.S.A | |
| EP1673230B1 (en) | Method for the production of a stamping tool to stamp safety elements in surfaces of carrier materials, as well as carrier material with at least one safety element | |
| CN215203934U (en) | Large-breadth seamless anti-counterfeiting holographic plate and manufacturing device thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |